Female DNA Found on Bomb in Boston

Remnants of a pressure-cooker bomb used in the Boston attack that killed three people.

Investigators have found female DNA on at least one of the bombs used in the Boston Marathon attacks, though they haven't determined whose DNA it is or whether its presence means a woman helped the two brothers suspected in the bombings, according to U.S. officials briefed on the probe.

Remnants of a pressure-cooker bomb used in the Boston attack that killed three people.

Investigators have found female DNA on at least one of the bombs used in the Boston Marathon attacks, though they haven't determined whose DNA it is or whether its presence means a woman helped the two brothers suspected in the bombings, according to U.S. officials briefed on the probe.